Thousands of customers purchased the I-Heart-Stats app last year. A sample of the ages (in years) of several of these customers is given below. What is the standard deviation of this data? Round your answer to 2 places after the decimal point, if necessary.
standard deviation =
| x |
|---|
| 42.7 |
| 28 |
| 59.8 |
| 35.7 |
| 59.5 |
| 36.9 |
| 49.7 |
standard deviation =